Factors associated with latent fingerprint exclusion determinations

Area of Science:

• Forensic Science
• Friction Ridge Analysis

Background:

• Exclusion, a critical determination in latent print examination, signifies that two friction ridge impressions do not share a common source.
• Existing literature predominantly focuses on individualization, with limited research on the factors influencing exclusion decisions.

Purpose of the Study:

• To experimentally assess the associations between various factors and exclusion determinations made by latent print examiners.
• To identify measurable factors that correlate with exclusion rates and the likelihood of erroneous exclusions.

Main Methods:

• An experimental study design was employed to analyze exclusion determinations.
• Data collected included image quality, examiner assessments, minutia counts, comparison difficulty, and the presence of specific friction ridge features (cores, deltas).

Main Results:

• Erroneous exclusions were found to be distributed across images and examiners, though more likely in certain scenarios.
• Factors significantly associated with exclusion rates included latent print quality, value determinations, minutia count, comparison difficulty, and the presence of cores or deltas.

Conclusions:

• Understanding the identified associations can elucidate circumstances contributing to errors and variations in reproducibility.
• The findings aim to enhance examiner training, casework quality assurance, and inform the broader community about the accuracy and reliability of exclusion decisions.